Emi Harukaze is a high-earning, elite office lady from a wealthy family—her parents run a company, and she works at a foreign-owned life insurance firm, earning over 20 million yen annually. Arrogant by nature, she looks down on working-class men and pays them no mind. But one day, while handling a customer complaint at her boss's request, she witnesses a shocking scene: a manual laborer and a female college student engaged in intense sexual activity. Overwhelmed by shock and arousal, she can't suppress her desires and begins passionately masturbating right there on the spot. Yet her excitement refuses to subside, only intensifying her primal urges further and further.